Metallic fastening



(No Model.)

1?. BEAN.

METALLIC FASTENING.

N0. 365,898. Patented Ju ly 5, 1887.

. UNITED STATES rrrnnr rFrcE.

FRANK BEAN, OF MEDFORD, ASSIGNOR OF ONE-HALF TO FRANK D. MARCH, OF CAMBRIDGE, MASSACHUSETTS.

METALLIC FASTENING.

SPECIFICATION forming part of Letters Patent No. 365,898, dated July 5, 1887.

Application filed March 23, 1887.

To aZZ whom it may concern:

Be it known that I, FRANK BEAN, of Medford, in the county of Middlesex and Commonwealth of Massachusetts, have invented a 'new and useful Improvement in Nails or Metallic Fastenings, of which the following is a specification, reference being had to the accompanying drawings, in which myinvention is embodied in the best way now known to me, and in which- Figure 1 is a plan and edge view ofa blank from which the preferred form of my fastening, shown in Fig. 2, is made. Fig. 3is aside elevation, enlarged, of the preferred form of my fastening. Fig. 4 is a side view of the same, showing edges of its shanks. Fig. 5 is a sectional detail of the same, and Fig. 6 is an enlarged sectional view, showing two sheets'of material united by a series of the preferred form of fastening.

My invention consists in a metallic fastening whose head is hardened, and from which extend two parallel legs that are malleable, except near the points, which are hardened.

In the drawings, which show a fastening embodying my in vent-ion and of the form which i I now prefer, Fig. 1 shows a blank consisting of a head or body, a, and shanks b, punched out of sheet metal. Shanks bare cut of uniform breadth part of their length, say from 1 to 2, and are cut tapering the rest of their length, say from 2 to 3. In the manufacture of that form of my fastening shown in the drawings this blank is carried into a female die of proper shape, and by the action of a properly-shaped male die shanks b are swaged, by pressure, between the dies on the uncut sides to complete the point. The blank is then struck up into the shape shown in Fig. 2. Fastenings thus made are then rattled, and are japanncd, tinned, or coppered, if desired. It will be readily seen that in every form of nail or fastening embodying my invention there is an equal amount of metal on opposite sides of the axial line of the shank, and this is of the ut- 1nostimportance,in order that the shank may be driven straight through the sheets withouterippling, and in order that the extreme ends of the shanks may so strike the anvil as to turn back into the material through which they are driven. It will also be seen that the swaging Serial No. 232,117. (No model.)

of the points of the shank renders the points of the shank smooth and uniform, and that this condition of the shank adapts it to be driven through elose-fibered and hard materials. Each shank 6, between the head and the lower portion of the shank-say from 1 to 2is substantially of the same malleable condition as the original metal, but toward its end is materially stiffened by the swagi'ng op eration; and the shank, by reason of the stiffness thereby imparted to it, is further adapted to be readily driven through the sheets, though it is not rendered so stiff as not to bend and turn back into the material when its extreme end strikes the anvil. The head or body a, when cup-shaped, is stiffened by the blow that cup-shapes it, and by reason of its being cupshaped is adapted to take a firm hold upon the material which fills the cup in the head when fasteningsof this form are driven home, the cup then receiving the ends of the inwardlyturned shanks, as illustrated in Fig. G ,whereby the sheets are united with great nicety and strength in a manner wholly new with me.

XVhen my nails or fastenings are to be used to secure together two or more sheets, the length of the shank is such as to suit the material to be united that is, each shank is of a length enough more than the thickness of the material to be united to provide for the clinch.

I do not claim the staple shown in my application, Serial No. 213,457, forI have found since making application for that fastening that it is anticipated by Thayers button-fastener, (shown in his Patent No. 293,539,) and I have also found that in operating the machine described in the allowed application of myself and another, Serial No. 213, 840, and in my application, Serial No. 233,607, for a patent for an improved machine for driving metallic fastenings, that a fastening of the form shown in my said application, Serial No. 213,457, cannot be driven in a machine in such a way as to produce a surface free from projections on the prong side of the sheets united.

As my new nail or fastening is specially intended for use in the manufacture of brogans and the like, it is absolutely necessary that I should have a fastening whose shank is not only stiff enough to pierce the leather when driven, but which will clinch when forced through the stock in such manner that the prong side of the sheets united is free from metallic projections; and I have discovered that in order to do thisa fastening whose prong or prongs are of the peculiar form and molec-;

ular condition herein described and claimed is essential. t

I am aware of Patents No. 333,700,to Thon1pson; No. 286,732, to Prentice; No. 327,515, to Bradley, and No. 160,042, to Van Benschoten, and disclaim all that is shown in them.

\Vhat I therefore claim is- The improved metallic'fastening herein described, consisting ofthchardened cupped-head I5 a and the two parallel malleable shanks I), havinghardened and tapered points, snbstantiall y as and for the purpose set forth.

FRANK BEAN.

Witnesses:

OHs. HOUGHTON, FRANK D. MARCH, 

